<template>
  <div>
      <h1>当前求和为：{{sum}}</h1> 
      <h3>当前求和放大10倍后为：{{bigSum}}</h3> 
      <h3>我在{{school}}，学习{{subject}}</h3>
      <select v-model.number="n">
        <option value="1">1</option>
        <option value="2">2</option>
        <option value="3">3</option>
      </select>
      <button @click="increment">+</button>
      <button @click="decrement">-</button>
      <button @click="incrementOdd">当前求和为奇数再加</button>
      <button @click="incrementWait">等一等再加</button>
  </div>
</template>

<script>
    import {mapState,mapGetters} from 'vuex'
    export default {
        name:'Count',
        data() {
            return {
                n:1,     //用户选择的数字
               
            }
        },
        methods: {
            increment(){
                this.$store.commit('JIA',this.n)
            },

            decrement(){
                this.$store.commit('JIAN',this.n)
            },

            incrementOdd(){
                this.$store.dispatch('jiaOdd',this.n)
            },

            incrementWait(){
                this.$store.dispatch('jiaWait',this.n)
            }
        },

        computed:{
            // sum(){
            //     return this.$store.state.sum
            // },
            // school(){
            //     return this.$store.state.school
            // },
            // subject(){
            //     return this.$store.state.subject
            // },

            // bigSum(){
            //     return this.$store.getters.bigSum
            // },

            //借助mapState生成计算属性，从state中读取数据（对象写法）
            // ...mapState({sum:'sum',school:'school',subject:'subject'}),

            //借助mapState生成计算属性，从state中读取数据（数组写法）
            ...mapState(['sum','school','subject']),

            //借助mapGetters生成计算属性，从Getters中读取数据（对象写法）
            ...mapGetters({bigSum:'bigSum'}),

            //借助mapGetters生成计算属性，从Getters中读取数据（数组写法）
            // ...mapGetters(['bigSum']),

        },
        mounted() {
            // const x = mapState({sum:'sum',school:'school',subject:'subject'})
            // console.log(x)
        },
    }
</script>

<style>
    button {
        margin-left: 5px;
    }
</style>
